His sister left home in 1998, and __________ since.
| A．had not been heard of |
| B．has not been heard of |
| C．had not heard of |
| D．has not heard of |
Sean has formed the habit of joggingthe tree-lined avenue for two hours every day.
| A． | between | B． | along | C． | below | D． | with |
That is the only way we can imaginethe overuse of water in students' bathrooms.
| A． | reducing | B． | to reduce | C． | reduced | D． | reduce |
（北京卷28）. It took me a long time before I was able to fully appreciate what they __ for me.
| A．had done | B．did | C．would do | D．were doing |
（北京卷26）. --I'm sorry, but I don't quite follow you. Did you say you wanted to return on September 20?
--Sorry, I myself clear. We want to return on October 20.
| A．hadn't made | B．wouldn't make | C．don't make | D．haven't made |
.（北京卷24）. --I'm not finished with my dinner yet.
--But our friends for us.
| A．will wait | B．wait | C．have waited | D．are waiting |